Sounds familiar to me. I've been on and off journaling since I'm about 12 years old and I tend to use several diaries parallel, but they all are really different from each other. I just decided I will use them all up before I start a fresh one and them just use one at a time. plus, I have a lot of fresh ones of all shapes and sizes sitting around, waiting to be filled or take the place of one of my theme-books (related to a certain topic, project, city, language..) I don't have a favorite pen to write in a certain notebook. It all depends on what I feel for, same problem with my various journals.